My experience is the new aggressive strains of fireblight hit these badly
Kieffer, Kosui Asian, Harrow Delight,
I would focus on these mentioned
Potomac, Magness, warren, and Seckel.
This is mostly what i’ve been experimenting with last year although i do have more i could add
Please take a look at these
This is what im up to in 2024
https://growingfruit.org/t/pears-clarkinks-is-looking-for-in-2024/58531
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